Study On Heavy Duty Truck's Taper-leaf Spring

The automobile industry is an important indicator of a country's industrial development and integrated manufacturing capabilities. At present, the demands of ride comfort and environmental protection of heavy duty truck are increasing. The taper-leaf spring compared with the traditional multi-leaf spring in the above-mentioned two areas has great advantages. As the ability of design and manufacturing, as well as material research and development are continuously improving, system of taper-leaf spring has leaded the direction of heavy-duty truck suspension development.First of all, the merits of taper-leaf spring and its application, both in domestic and abroad, are introduced. Based on a certain type of truck' load, the arrangement of space as well as the capacity of production, a general scheme of front and rear suspension system are proposed. The construction and analysis of the taper-leaf spring' mathmatic models were concluded which determined the structure and parameters of this taper-leaf spring. Finally, the samples were manufactured.Secondly, the analyses of both front and rear springs were carried on based on Hypermesh and ABAQUS software cooperatively. According to different content of finite element analysis, 3D models are created accordingly. The characteristics of flexibility, that is, the stiffness of front and rear leaf spring assemblies are analyzed. Beyond this, assembly stress and its distribution under different load conditions of each leaf were analyzed as well.And what's more, in order to verify the accuracy of the finite element analysis, testing proposals and methods are conclueded according to corresponding contents of the validation. Bench test of the characteristics of flexibility and the stress distribution of front and rear leaf spring are performed respectively. based on the work above, focusing on stiffness, stress, deformation of both front and rear springs, the results of finite element analysis and the data from bench testing were compared and analyzed together. The accuracy of this finite element analysis were verified.Last but not the least, according to the stiffness data of leaf spring, suspension system model of the taper-leaf spring, which were founded on ADAMS, simulated its damping performance in the condition of a rude path.